Do they break down the customers that have been sold to, into male and female for example?

There is some research suggesting that sales staff are better/worse at selling to some groups than others and I am trying to get at why that might be and try to smooth it out a bit.

I am interested in sectors where the staff have some real influence over whether or not a sale is made and where they can nail data showing who has sold to who. I had thought motor retail but I am told negotiations over price these days tend to be less the sales person's domain and more the sales manager.